Machine for grinding the scores in tack-dies



(No Model.) 3 Sheets-Shet 1.

A. EJOONVERS.

MAGHINB FOR GRINDING THE SCORES IN TACK DIES. No. 359,533. Patented Mar.15, 1887. r

N, Pz'tans, Phowulnognpher. Washingnn. m c

(No Model.)

3 Sheets-Sheet 2. A, E. GONVERS.

MAGHINE FOR GRINDING THE SUORES IN TACK DIES.

No. 359,533. Patented Mar 15, 1887.

(No Model.) I 3 Shets-Sheet 3.

A. E. GONVERS.

MACHINE FOR GRINDING THE SCORES IN TAGK- DIES.

No. 359,533. Patented M6.I'.-15, 1887;

Y N I NNNNNN S Phatfljuwgnphar, Washington. D C

4 NITED STATES PATENT Fries.

ALBERT E. CONVERS, OF TAUNTON, MASSACHUSETTS.

MACHINE FOR GRINDING THE SCORES IN TACK-DIES.

SPECIFICATION forming-part of Letters Patent N0.359,533, dated March 15,1887.

Application filed May 10, 1856. Serial No. 201,765. (No model.)

To all whom it may concern.-

Be it known that I, ALBERT E. CONVERS, of Taunton, in the county ofBristol and State of Massachusetts, have invented a new and ImprovedMachine for Grinding the Scores in Dies used in the Manufacture ofTacks, of which the following is a specification. k

In the art of tack-making the portion of the tack next below the head isrounded bybeing pressed between opposite dies, each of which is providedwith a substantially semicircular groove or score.

It is the object of this invention to provide a machine which will form,by grinding, these scores with exactness to any required depth, such as.0i7-inch, .12i-inoh, .9l7inch, &c.

In the accompanying drawings, in which similar letters of referenceindicate like parts, Figure 1 is a side elevation of a machine embodyingmy invent-ion. Fig. 2 is a vertical section on line as, Fig. 3. Fig. 3is a plan of the machine. Fig. 4c is an enlarged plan showing thecarrying mechanism in detail. Fig. 5 is a detail view of theindex-wheel.

A is an inclined bed supported by legs B. Cis a platen which slides inaV-shaped groove, 0, 011 the bed A. The position of this groove (which isnot an essential part of the invention) is indicated by broken lines inFig. 1. Brackets D, extending from the bed A, substantially at rightangles thereto, support a suitable emery grinding-machine, E. Thismachine may be constructed inany desired manner, and'includes one ormore sets of emcry-wheels E, of different sizes, so as to produce scoresof correspondingly different sizes, driving mechanism E, 85c. The platencarries onits upper end a sliding adjustable measuring and carryingmechanism, which consists of a base, F, sliding in a slot, F, formed inthe head of the platen, and of the second slide, H, carrying a thirdslide, H, which carries the clamp I. This slide H is set into the slide,H, so as to be flush with its surface.

The clamp I, which is pivoted at I in the ears 1, extending from theslide H, is provided with an adjusting-screw, J, by means of which thesurface K of such clamp may be adjusted so as to be on a radial linewith the emerywheel, in which case it would be at an exact right anglewith a line tangential to the wheel at the point of contact of' the two,or be at any eral degrees on each side.

angle desired to said line witliin a limit of sev- The slide H is provided with the scale L, on which the pointer Z of the clamp I indicatesthe position of the surface of said clamp relative to said radial line.two binding-screws,a,and clamps b,for securely holding the same in anydesired position on the platen, and, furthermore, with a screw, N, andalso with a screw, P, the end of which latter carries an index-wheel, B.This wheel R has a groove cut in its periphery. said groove beingparallel with the axis of the wheel, at the zero-point of the index, andis held in that position by a hinged finger, S, (see Figs. land 5,)which engages in said groove. Each slide is held in contact with itspropelling-screw by the springs T.

Reciprocating longitudinal motion is imparted to the platen C by meansof the cranked shaft U and connecting-rod V, pivoted at V to thebracketV, rigidly secured to said platen, said shaft being driven by abelt on the pulley WV. Y is a balancewbeel counterbalanced at Y, so thatwhen it rests the platen is at the center of its travel.

The table Z, between the brackets D, is slotted, so that the grindingmechanism B may be moved up to the measuring and carrying mechanism asthe emery-wheels E wear away.

The operation is as follows: The diein which a score is desired to beformed by grinding, and which is illustrated by the letter in thedrawings, is placed in position in the clamp I, and is firmly secured insuch position by one of the screws N. The measuring and carryingmechanism is adjusted longitudinally on the platen C, so as to cause thedie at the point at which it is desired to grind the score to comeexactly opposite the wheel with which it is desired that the scoreshould be ground, and said mechanism is firmly secured in such positionby the screws a and their respective clamps. The screw L is intended toso adjust the die that its face will be parallel with the axis or theemery-wheel. Motion having been imparted to the platen by the drivingmechanism, the clamp carrying the die is fed toward the emery-wheel bythe screw N until contact is reached, and no farther. Then, with thepoint of contact as the starting-point, the die is further fed againstthe wheel to the exact The mechanism is further provided with depthrequired by the index-screw P, which moves the slide H, its slide H, theclamp I, and consequently the die secured thereto and being operatedupon. Thus it will be seen that a score of the exact depth required canbe produced, and by means of the reciprocating motion imparted to theplaten such score is made of even depth throughout its entire length, ordeeper at either end than the other to a degree indicated by the pointerand scale.

A die placed at a different angle from the die 71 is shown in brokenlines in Fig. 4, and in practice a die of the shape shown in brokenlines and one of the shape shown in full lines usually constitutethepair which, when placed so that their scores are coincident, round thetack.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

1. In a machine for grinding scores in dies used in taclmnakiug, theherein-described adjustable carrying and measuring mechanism,consisting, essentially, of the base F, the slides H and H and theiradjusting-screws, indexwheel 1%, and a clamp for holding the die,substantially as and for the purpose described.

2. The combination, with the slides in the carrying mechanism providedwith the scale L, of the hinged or. pivoted die-holding clamp I,provided with the index finger Z, and adjusting-screw J, substantiallyas and for the pun pose described.

3. The carrying and measuring mechanism above described, consisting,essentially, of the base F, slides H H, pivoted clamp I, screws J, N,and P, index-finger Z, scale L, indexwheel It, and hinged finger S,substantially as and for the purpose set forth.

ALBERT E. CONVERS,

Witnesses:

HENRY XV. WILLIAMs, J, M. ITARTNETT.

